Honestly, I think this actually may have something to do with it. He slimmed down in the off season & it sounds like to me that he wasn't going to press the issue continuing on using HGH (allegedly of course). He's got too much to protect & the way all these crack downs have occurred in other sports the last thing LeBron or the NBA for that matter needs is to have somebody nail him with proof of HGH.
It makes sense to me that when he dicided to return to Cleveland he also decided to cut that shit out & start fresh. He used the whole diet/slim down offseason regimen thingy to cover UP the weight loss. This is the player that LeBron really is, still great, still the best the league has to offer but not the eye popping ridiculous dominate player the HGH (allegedly of course) made him.
I mean he only has 2 dunks on the season